The Origin and Significance of Tuberculosis of the Tracheo-Bronchial Lymph Nodes of the Lung *Awarded a Martyn Memorial Pathological Prize.

The frequency of latent tuberculosis has been recognized since the latter part of the seventeenth century, but the true significance of these latent lesions in relation to other tuberculous conditions has not received the attention they merit. Recently, however, Continental and American workers have thrown some light on this important subject. In particular, E. L. Opie,1 of Pennsylvania, points out the following two conflicting factors which must be considered when dealing with " latent tuberculosis."